Dave, you have brought up something I have wondered about for some time. I have had my kx3 for three plus years and have been on many lists and most everyone wants a smps instead of a small 3 amp linear supply. Radio Shack and many others made these supply's and they are plentiful at Hamfests for 10-20 USD. It seems like a lot of folks operate from home and want a smps . Why, if the weight would not be a factor, do folks want to take a chance on a potentially noisy ps ? I use a big linear supply which also feeds my IC7200 but if the need arises I use a small linear supply. I do have a nice switcher which I do not notice any noise but it is used a bench supply. It is a Alinco something 330. Variable output and has noise shift. Anyway, I don't want to hijack this thread, just wondering.
On Monday, June 20, 2016, Dave B via Elecraft <[email protected]> wrote: > Cant help thinking, that the charge to discharge "Efficiency" is probably > no better than a good linear PSU, but you do I guess get the "Off grid" > option for EMCOM work.. > > There ARE (RF)quiet SMPS's out there, but not priced in a way that will > suit the average Ham's budget. You get what you pay for. Oh, and they > tend to be large too, due to the filtering. > > Quite honestly, for "Amateur" work, where the rig will usually spend most > of it's life in RX, a linear PSU is just fine. Plus, you can fix them > when things fail. Try that with a modern well suppresed QRO SMPS!.. > > 73. > > Dave G0WBX. > > > ~~~ Original message. > > From: Marc Veeneman<[email protected]> > To:[email protected] > Cc:[email protected] > Subject: Re: [Elecraft] RFI on K3s > Message-ID:<[email protected]> > Content-Type: text/plain; charset=us-ascii > > My PowerWerx supply DOES generate those drifting noise spikes, ruining CW > on 80 meters for me. I have yet to find a 13.8 volt switching supply that > can provide 25 quiet amps. I've gone entirely to batteries rather than use > quiet but inefficient linear supplies. > > Now I only have SMPS noise when recharging the batteries. So I leave > that for non-hamming hours. More testing is needed, but I did find one > SMPS for LiFePO4 batteries that seemed RFI free. It's an Optimate brand > product but only produces 5 amps. > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > -- Rick, W8ZT Sent from Gmail Mobile ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
